JPH04105421U - Insulator type electrical equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To detect airtight breaks in insulator-type electrical equipment without causing a power outage. [Structure] A pressure sensor is installed in the gas space above the oil surface of the insulating oil inside the insulator type electrical equipment.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is based on insulator electric machines that have oil inside, such as oil-filled bushings and oil-filled transformers. It is related to vessels.

0002

[Conventional technology]

Conventionally, in insulator-type electrical equipment such as oil-filled bushings and oil-filled transformers, internal oil Inject nitrogen gas into the space above the surface at a pressure of about 0.3 to 0.5 kg/cm2 (gauge pressure ) to prevent deterioration of the insulating oil.

0003

[Problem that the idea aims to solve]

As mentioned above, insulator type electrical equipment eliminates deterioration of insulating oil by filling nitrogen gas. However, after many years of use, the seals such as gaskets that maintain airtightness may deteriorate. Airtightness may be broken. If the airtightness breaks, the sealed nitrogen gas will released, and the atmosphere and atmospheric moisture enter. As a result, insulating oil is exposed to air and moisture. This leads to rapid deterioration, and the insulation performance deteriorates, making it impossible to perform its original function.

0004 Conventionally, the methods for detecting airtight breaks include visual inspection from the outside, A small amount of edge oil was taken out and analyzed to see if it had deteriorated. However, using this method The problem is that a power outage is required to detect the problem, and the detection process takes a long time. There was a point. This idea was made to solve the problems mentioned above, and it An insulator-type electric machine that can detect airtight breaks in insulator-type electric equipment without the need for The purpose of this invention is to provide an abnormality detection device for equipment.

[0005]

[Means to solve the problem]

This idea is used in insulator-type electrical equipment that has oil inside. The feature is that a pressure sensor is provided in between.

[0006]

[Effect]

In this invention, a pressure sensor constantly detects the gas pressure in the space above the oil surface.

[0007]

【Example】

FIG. 1 is a sectional view of an oil-filled bushing (20) according to a first embodiment of this invention. figure In this case, the center conductor (1) passes through the inside of the insulator tube (3), and the center conductor (1) is surrounded by a A capacitor cone (insulating paper) (4) is attached. Insulator tube (3) and condenser Insulating oil (5) is filled between the ring (4) or the center conductor (1), and the oil level is equal to that of the insulated pipe ( 3) reaches into the expansion chamber (2) which is fixed at the upper end. The center conductor (1) is the expansion chamber (2) The cable (not shown in the figure) is attached to the upper end (13) of the ) etc. are connected. The insulator (3) is supported by a support part (14), and this support part (14) An insulating oil sampling port (9) is provided at the insulating oil sampling port (9). The support part (14), insulator tube (3) and expansion chamber (2) are mutually connected. It is firmly fixed to keep it airtight.

[0008] An oil level gauge (10) is attached to the expansion chamber (2) via a gasket (11), and the oil level gauge (10) is attached to the oil level above the oil level. Nitrogen gas (12) is sealed in the space (A) at a predetermined pressure. Also, the pressure gauge (6) , on the outer wall of the expansion chamber (2) with its pressure introduction part (6a) exposed to the space above the oil surface (A). installed. The pressure gauge (6) is for detecting the pressure in the space above the oil surface. The commonly used Bourdon tube type, diaphragm type, semiconductor type, etc. pressure sensor.

[0009] Next, the operation of the above embodiment will be explained. Circumference of oil surface type (10) of insulator type electrical equipment If the gasket (11) surrounding the enclosure or any other connection part breaks, the oil level will rise. Nitrogen gas (12) sealed in space (A) is released into the atmosphere and the gas pressure decreases. Ru. The pressure gauge (6) detects a drop in gas pressure and displays the pressure. this pressure Observe the display on the gauge (6) with the naked eye or with binoculars from a specified safe distance. This will allow you to see if the airtight has broken.

0010 FIG. 2 is a sectional view showing a second embodiment of this invention. Same part as the first embodiment The same reference numerals are given to the parts, and the explanation thereof will be omitted. The pressure sensor (15) converts pressure into a light signal. It is a sensor that can be sent instead of the oil surface, and its pressure introduction part (15a) is connected to the space above the oil surface (A). It is attached to the outer wall of the expansion chamber (2) in an exposed state. Pressure sensor(15) The output signal is transmitted through the optical cable (7) to the control unit ( 8). The control unit (8) converts the received optical signal into an electrical signal and displays the pressure. I do. The optical cable (7) not only transmits signals but also provides insulation between the expansion chamber (2) and the control unit (8). maintain.

[0011]

[Effect of the idea]

As described above, according to this invention, a pressure sensor is installed in the space above the oil surface of an insulator-type electric device. It is configured to detect the gas pressure and display the pressure, so you don't have to get too close to it. It is also possible to detect the occurrence of an airtight break due to a drop in gas pressure. Therefore, power outage This has the effect of being able to detect deterioration of the insulating oil without causing damage.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an insulator-shaped electric device according to a first embodiment of the invention.

FIG. 2 is a sectional view showing an insulator-shaped electric device according to a second embodiment of the invention.

[Explanation of symbols]

5 Insulating oil 6 Pressure gauge 15 Pressure sensor 20 Oil filled bushing A gas space

Claims (1)

[Scope of utility model registration request] 1. An insulator-type electric device containing oil therein, characterized in that a pressure sensor is provided in a gas space above the oil surface.